/**
 * @author Roger Wu
 */

(function($) {
var jmenus = new Map();
// If the DWZ scope is not available, add it
$.dwz = $.dwz || {};

$(window).resize(function(){
    setTimeout(function(){
        for (var i=0; i<jmenus.size();i++){
            fillSpace(jmenus.element(i).key);
        }
    }, 100);
});
$.fn.extend({
    accordion: function(options, data) {

        var args = Array.prototype.slice.call(arguments, 1);

        return this.each(function() {
            if (options.fillSpace) jmenus.put(options.fillSpace, this);
            if (typeof options == "string") {
                var accordion = $.data(this, "dwz-accordion");
                accordion[options].apply(accordion, args);
            // INIT with optional options
            } else if (!$(this).is(".dwz-accordion"))
                $.data(this, "dwz-accordion", new $.dwz.accordion(this, options));
        });
    },
    /**
     * deprecated, use accordion("activate", index) instead
     * @param {Object} index
     */
    activate: function(index) {
        return this.accordion("activate", index);
    }    
});

$.dwz.accordion = function(container, options) {
    
    // setup configuration
    this.options = options = $.extend({}, $.dwz.accordion.defaults, options);
    this.element = container;
    
    $(container).addClass("dwz-accordion");
    if ( options.navigation ) {
        var current = $(container).find("a").filter(options.navigationFilter);
        if ( current.length ) {
            if ( current.filter(options.header).length ) {
                options.active = current;
            } else {
                options.active = current.parent().parent().prev();
                current.addClass("current");
            }
        }
    }
    // calculate active if not specified, using the first header
    options.headers = $(container).find(options.header);
    options.active = findActive(options.headers, options.active);

    if ( options.fillSpace ) {
        fillSpace(options.fillSpace);        
    } else if ( options.autoheight ) {
        var maxHeight = 0;
        options.headers.next().each(function() {
            maxHeight = Math.max(maxHeight, $(this).outerHeight());
        }).height(maxHeight);
    }

    options.headers
        .not(options.active || "")
        .next()
        .hide();
    options.active.find("h2").addClass(options.selectedClass);
    
    if (options.event)
        $(container).bind((options.event) + ".dwz-accordion", clickHandler);
};

$.dwz.accordion.prototype = {
    activate: function(index) {
        // call clickHandler with custom event
        clickHandler.call(this.element, {
            target: findActive( this.options.headers, index )[0]
        });
    },
    
    enable: function() {
        this.options.disabled = false;
    },
    disable: function() {
        this.options.disabled = true;
    },
    destroy: function() {
        this.options.headers.next().css("display", "");
        if ( this.options.fillSpace || this.options.autoheight ) {
            this.options.headers.next().css("height", "");
        }
        $.removeData(this.element, "dwz-accordion");
        $(this.element).removeClass("dwz-accordion").unbind(".dwz-accordion");
    }
}

function scopeCallback(callback, scope) {
    return function() {
        return callback.apply(scope, arguments);
    };
}

function completed(cancel) {
    // if removed while animated data can be empty
    if (!$.data(this, "dwz-accordion"))
        return;
    var instance = $.data(this, "dwz-accordion");
    var options = instance.options;
    options.running = cancel ? 0 : --options.running;
    if ( options.running )
        return;
    if ( options.clearStyle ) {
        options.toShow.add(options.toHide).css({
            height: "",
            overflow: ""
        });
    }
    $(this).triggerHandler("change.dwz-accordion", [options.data], options.change);
}

function fillSpace(key){
    var obj = jmenus.get(key);
    if (!obj) return;
    
    var parent = $(obj).parent();
    var height = parent.height() - (($(".accordionHeader", obj).size()) * ($(".accordionHeader:first-child", obj).outerHeight())) + 1;

    var os = parent.children().not(obj);
    $.each(os, function(i){
        height -= $(os[i]).outerHeight();
    });
    $(".accordionContent",obj).height(height);
}

function toggle(toShow, toHide, data, clickedActive, down) {
    var options = $.data(this, "dwz-accordion").options;
    options.toShow = toShow;
    options.toHide = toHide;
    options.data = data;
    var complete = scopeCallback(completed, this);
    
    // count elements to animate
    options.running = toHide.size() == 0 ? toShow.size() : toHide.size();
    
    if ( options.animated ) {
        if ( !options.alwaysOpen && clickedActive ) {
            $.dwz.accordion.animations[options.animated]({
                toShow: jQuery([]),
                toHide: toHide,
                complete: complete,
                down: down,
                autoheight: options.autoheight
            });
        } else {
            $.dwz.accordion.animations[options.animated]({
                toShow: toShow,
                toHide: toHide,
                complete: complete,
                down: down,
                autoheight: options.autoheight
            });
        }
    } else {
        if ( !options.alwaysOpen && clickedActive ) {
            toShow.toggle();
        } else {
            toHide.hide();
            toShow.show();
        }
        complete(true);
    }
}

function clickHandler(event) {
    var options = $.data(this, "dwz-accordion").options;
    if (options.disabled)
        return false;
    
    // called only when using activate(false) to close all parts programmatically
    if ( !event.target && !options.alwaysOpen ) {
        options.active.find("h2").toggleClass(options.selectedClass);
        var toHide = options.active.next(),
            data = {
                instance: this,
                options: options,
                newHeader: jQuery([]),
                oldHeader: options.active,
                newContent: jQuery([]),
                oldContent: toHide
            },
            toShow = options.active = $([]);
        toggle.call(this, toShow, toHide, data );
        return false;
    }
    // get the click target
    var clicked = $(event.target);
    
    // due to the event delegation model, we have to check if one
    // of the parent elements is our actual header, and find that
    if ( clicked.parents(options.header).length )
        while ( !clicked.is(options.header) )
            clicked = clicked.parent();
    
    var clickedActive = clicked[0] == options.active[0];
    
    // if animations are still active, or the active header is the target, ignore click
    if (options.running || (options.alwaysOpen && clickedActive))
        return false;
    if (!clicked.is(options.header))
        return;

    // switch classes
    options.active.find("h2").toggleClass(options.selectedClass);
    if ( !clickedActive ) {
        clicked.find("h2").addClass(options.selectedClass);
    }

    // find elements to show and hide
    var toShow = clicked.next(),
        toHide = options.active.next(),
        //data = [clicked, options.active, toShow, toHide],
        data = {
            instance: this,
            options: options,
            newHeader: clicked,
            oldHeader: options.active,
            newContent: toShow,
            oldContent: toHide
        },
        down = options.headers.index( options.active[0] ) > options.headers.index( clicked[0] );
    
    options.active = clickedActive ? $([]) : clicked;
    toggle.call(this, toShow, toHide, data, clickedActive, down );

    return false;
};

function findActive(headers, selector) {
    return selector != undefined
        ? typeof selector == "number"
            ? headers.filter(":eq(" + selector + ")")
            : headers.not(headers.not(selector))
        : selector === false
            ? $([])
            : headers.filter(":eq(0)");
}

$.extend($.dwz.accordion, {
    defaults: {
        selectedClass: "collapsable",
        alwaysOpen: true,
        animated: 'slide',
        event: "click",
        header: ".accordionHeader",
        autoheight: true,
        running: 0,
        navigationFilter: function() {
            return this.href.toLowerCase() == location.href.toLowerCase();
        }
    },
    animations: {
        slide: function(options, additions) {
            options = $.extend({
                easing: "swing",
                duration: 300
            }, options, additions);
            if ( !options.toHide.size() ) {
                options.toShow.animate({height: "show"}, options);
                return;
            }
            var hideHeight = options.toHide.height(),
                showHeight = options.toShow.height(),
                difference = showHeight / hideHeight;
            options.toShow.css({ height: 0}).show();
            options.toHide.filter(":hidden").each(options.complete).end().filter(":visible").animate({height:"hide"},{
                step: function(now) {
                    var current = (hideHeight - now) * difference;
                    if ($.browser.msie || $.browser.opera) {
                        current = Math.ceil(current);
                    }
                    options.toShow.height( current );
                },
                duration: options.duration,
                easing: options.easing,
                complete: function() {
                    if ( !options.autoheight ) {
                        options.toShow.css({height:"auto"});
                    }
                    options.toShow.css({overflow:"auto"});
                    options.complete();
                }
            });
        },
        bounceslide: function(options) {
            this.slide(options, {
                easing: options.down ? "bounceout" : "swing",
                duration: options.down ? 1000 : 200
            });
        },
        easeslide: function(options) {
            this.slide(options, {
                easing: "easeinout",
                duration: 700
            })
        }
    }
});
})(jQuery);
